Update ivy-local settings for XMvn 2.0.0

There are 2 main changes here:

1) XMvn 2.0.0 uses new namespace org.fedoraproject.xmvn

2) XMvn 2.0.0 uses isolated class realm to load its dependencies
   without polluting classpath, meaning that only a few JARs need to
   be added to Ant classpath in order to get working Ivy resolver.